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CCNA Subnet Mask

Host, Network, Slash conversions

TermDefinition
/32 1 single ip, subnet mask 255.255.255.255, available subnets 254
/31 2 usable/host with a point to point, subnet mask 255.255.255.254, available subnets 128
/30 2 usable/hosts, subnet mask 255.255.255.252, available subnets 64
/29 6 usable/hosts, subnet mask 255.255.255.248, available subnets 32
/28 14 usable/hosts, subnet mask 255.255.255.240, available subnets 16
/27 30 usable/hosts, subnet mask 255.255.255.224, available subnets 8
/26 62 usable/hosts, subnet mask 255.255.255.192, available subnets 4
/25 126 usable/hosts, subnet mask 255.255.255.128, available subnets 2
/24 254 usable/hosts, subnet mask 255.255.255.0, available subnets 1
/23 510 usable/hosts, subnet mask 255.255.254.0
/22 1022 usable/hosts, subnet mask 255.255.252.0
/21 2046 usable/hosts, subnet mask 255.255.248.0
/20 4094 usable/hosts, subnet mask 255.255.240.0
/19 8190 usable/hosts, subnet mask 255.255.224.0
/18 16,382 usable/hosts, subnet mask 255.255.192.0
/17 32,766 usable/hosts, subnet mask 255.255.128.0
/16 65,534 usable/hosts, subnet mask 255.255.0.0
Created by: marallander